[terraform] deploy backup 0.5.0 to prod

Summary:
Deploy the work tracked as part of [ENG-9644](https://linear.app/comm/issue/ENG-9644/backup-service-backup-client-work-for-a-minimal-version-of-backup).

Changes are diffs from the stack starting with D13803.

Backup images are [here](https://hub.docker.com/r/commapp/backup-server/tags)

Git tag [link](https://github.com/CommE2E/comm/tree/backup-v0.5.0).

The staging deploy was on Nov 7, so it's been less than a week. However, the Backup service is not used on production at all, so I'm publishing this diff ahead of time.

Test Plan: terraform plan

Reviewers: bartek, varun

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13904

services/terraform/remote/service_backup.tf

@@ -1,5 +1,5 @@
 locals {
-  backup_service_image_tag      = local.is_staging ? "0.5.0-staging" : "0.4.3"
+  backup_service_image_tag      = local.is_staging ? "0.5.0-staging" : "0.5.0"
   backup_service_container_name = "backup-service-server"
   backup_service_server_image   = "commapp/backup-server:${local.backup_service_image_tag}"
   backup_service_domain_name    = "backup.${local.root_domain}"